Sissy's gut sucking frogs -- I missed that one! GROSS!We have big koi - they leave our plants, including our lilies, alone. I know some people have trouble with koi and plants but for whatever reason ours have never bothered with them. We keep rocks in the pots to cover the roots, so there's not much to root around in.
One of our favorite plant store owners did tell us about a customer who was so upset because she went on a month long vacation and came back and her koi had eaten all her expensive lilies. Uh... maybe they were hungry??
I do think they learn some behaviors though and it can be impossible to stop once they do start - @sissy has a couple of koi that suck the guts out of frogs and leave the rest for her to fish out... never heard of anyone else with that kind of koi behavior!
Nice pond, Jimmy!!!